weiss



2 Sheets-Sheet 1.

(No Model.)

0l W WEISS SEWING 111110111115.

No. 403,163. PatentedMay 14, 1889.

N. FETERs Ph'ntn-Lilhugmpher, Waxhngton, D4 C4 (No Model.) l 1 2 Sheets-Sheet 2.l G. W. WEISS.

' SEWING MAGHINE.

No. 403,163. Patented May 14, 18879.l

NA PETERS, Pholn-Lilbogmphun Walhngm'ly D.

'UNITED STATES PATENT OEETCE.

CHARLES IV. WEISS, OF BROOKLYN, NEV YORK.

SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 403,163, dated May 14, 1889.

Application filed July 5, 1888. Serial No. 279,044. (No model.)

To all whom it may concern:

Be it known that I, CHARLES WV. VEIss, of the city of Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in the Stitch-Forming Mechanism of Sewing-Machines; and I do hereby declare that the following is a full and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon, making a part of this speciication, in which- Figure lis a side elevation of my improved sewing-machine with the looper in its stitchforming mechanism in its eXtreme rearward position; Fig. 2, a central vertical section of the looper and its carrier detached, taken in line with the axis of its shaft, the looper being in the same position as in Fig. l; Fig. 3, a detached view in side elevation of the looper and its carrier, illustrating the same in its eXtreme forward position; Fig. 4, a sectional view illustrating amodiication in the mechanism for guiding and controlling the band carrying the looper; Fig. 5, a plan view of the stitch-forming mechanism, the cloth-plate being removed; Fig. 6, a vertical,cross-section in line x x of Fig. 5; Figs. 7, 8, 9, and 10, detached views of the looper and needle, illustrating their relative positions at different stages in the formation of a stitch.

Similar letters of reference indicate like parts in all of the figures.

My invention relates to improved mechanism for imparting synchronically with the movements of the needle a reciprocating movement to a longitudinally perforated looper through which the second thread used in the formation of the stitches is carried, whereby greater simplicity and freedom of movement is obtained and the tension of the thread is automatically regulated; and it consists in the novel combination of devices hereinafter described and claimed.

In the accompanying drawings, A represents the frame; B, the cloth-plate; O, the main shaft; D, the vibrating needle-arm; E, the needle-bar; F, the needle, and O the eccentric on the' shaft O by which the needlearm D is oscillated in the accustomed manner.

S, Figs. 5 and G, is the feed-dog to which the usual four -way movement is imparted by means of a horizontal rocking` arm, G, pivoted in bearings in the end of a vertical rocking arm, G', said arms being severally oscillated by means of eccentrics I-I I-I on the main shaft in manner as well known to the art and which need not herein be more fully described.

The several parts, as above described, may be constructed, arranged, and combined for operation as in any of the approved forms of sewing-machines now in use in which the needle-bar is made to reciprocate at a right angle to the length of the shaft by means of the rotation of the latter.

My invention relates specially to the construction and operation of the looper, in combination with the reciprocating needle, and to this end I secure upon the main shaft O, which is extended so as to pass under the needle, a cylindrical block, I, so that it shall rotate with the shaft under the needle. A groove, J, (see Fig. 2,) preferably V-shaped in cross-section, is cut in the periphery of said cylindrical block to encircle it in 'a plane inclined at an angle of about siXty-ve degrees with its axis. The diagonally-opposed angles or edges a a of the block (see Figs. l, 2, and 3) are partially cut away by the groove, the center of the block being intersected by a plane extended through the bottom of the groove, as shown by the dotted lines y y y y in Fig. 2. The block is made fast to the shaft O by means of a set-screw, S. A divided band, K, is fitted to embrace and turn freely in said groove; but in the action of the machine said band is prevented from turning by means of an arm, L, projecting from its lower side between the parallel walls l) b of a slot.

or groove, O, (see Fig. 6,) formed in the bedplate of the machine centrally and longitudinally under the shaft O.

To avoid friction and allow a free reciprocating rotary movement of the arm L between its guide-walls h h, it is made to terminate in a ball, m, which is seated in concave semispherical recesses formed in the inner faces of two guide-plates, N N, Fig. 6, fitted to slide freely longitudinally between the walls b b and to partially embrace the ball m between them.

IOO

The looper consists of a longitudinallyperforated rod taperin towards its front end, and which is curved substantially in the form illustrated in the drawings. This looper O is secured to a bent arm, P, extending from the upper side of the band K immediately over the shaft C, the inner end, (l, of the arm being preferably inclined to the axis of theband atan angle of about one hundred and fifty degrees, and. its outer end, c, at about an angle of twenty degrees with the first, so that the main portion or stem. of the looper,which is inserted in a transverse perforation in said outer end,-e, of the arm to project upwardly therefrom, will form an angle with the axis of the band of about thirty degrees. r hclooper is secured by means of a set-screw, T.

As an equivalent device for controlling the movement of the band K, a link, V, (see Fig. 4,) maybe attached to the lower end of the band by means of a ball-and-socket joint, V', as a substitute for the rigid. arm L, the opposite end of the link being coupled, as shown in Fig. l, by a second ball-andsocket joint, Y2, to a stud, XV, secured to the bed-plate adjacent to the cylindrical block I and at one side of the center thereof. This link-connection will permit such freedom of movement as is required in the band l, and yet prevent such a revolution. thereof as would carry the looper O out of its proper path.

A tension device, Q, (see Fig. 1.,) of any si1nple form, placed under the cloth-plate B, preferably in the front corner of its rear edge, and an eye, R, is placed in the corresponding corner on the under side of the front edge of the plate, and the under thread, 3, carried from a spool to said tension device Q, is thence led through the eye R back to the rear end of the looper O and out through the longitudinal perforation therein.

In the movements of the machine the rotation of the shaft C will impart to the band K, carrying the looper O, a compound motion, whereby the looper will be made to recipro cate under the needle in a path parallel with the shaft C, but with a partially-rotary and laterally reciprocating movement, so that, passing by one side of the needle F, in close proximity thereto when the needle is down, it will be carried forward alongside of the needle during its upward stroke, and in returning to its first position will pass back on the opposite side of the needle, describing in its course an oblate path, as illustrated by the dotted line u. in Fig. 5, the proper relation of the looper to the needle necessaryin forming the stich being preserved duringits said movements by reason of its peculiar curved form, as illustrated in the drawings.

The looper O and the means, as described, for actuating it are so adj usted with reference to the needle F and the means for its actuation as thatthe two shall move synchronically and in such order as that when the needle, having completed its downward stroke, is in the actof moving upward, so as to leave an open loop, l, in the thread 2, which it carries, the front end of the looper, passing close by the needle, will engage said loop, as shown in Fig. '7. The looper, moving on forwa rd through the loop l left by the ascending needle, will carry with lit through said loop the lower thread, 3, which is led through the looper, as illustrated in Fig. i Se soon as the needle begins to descend, the looper begins to move back; but in moving back its front end. is swung around, so as to pass on the opposite side of the descending needle, (see Fig. 9 and dotted line fw in Fig. 5,) thereby carrying the lower thread, 3, on said opposite side, so that the needle will now pass down between the lower thread and the loop l,which, as the looper passes back of the needle, will slip off of the looper (see Fig. l0) in readiness to be drawn up to form a stitch at the next upward stroke of the needle.

As the looper nlakes its backward stroke the thread l is kept tight and slips through the looper until, as the looper in completin said backward stroke moves away from under the needle, the tension upon the thread is so increased as to operate to draw out a length thereof from the tension device (sce Fig. l0) sufficient to :form the next stitch, As the looper moves forward again it slackens this length, leaving it free to be taken up in the formation of the stitch, (see Fig. 7,) and no other take-up device lis needed. in connee tion with this thread.

I claim as my inventionl. The comlnnation, with the shaft :in a sewingmachine, of a cylindrical block fixed upon said shaft and having a peripheral groove formed thereon in a plane inclined to its axis, an oscillatingnon-revoluble band encircling said groove loosely, and a looper carried by said band, substantially in the manner and for the purpose herein set forth.

2. The combination, substantially as described, of the rotating cylindrical block l, having an inclined peripheral groove, the band K, encircling said groove loosely, the looper O, carried by said band, the guidearm L, projecting from said band and terminating in a ball or spherical end, in', and the lateral parallel guide-walls I) l), between which said plates are fitted to move freely.

3. The combination, in the stitch-forming mechanism of a sewing-machine, of the rotating shaft C, the reciprocating needle F, the means, substantially as described, whereby the needle is actuated by the rotation of the shaft, the looper O, traversing the path of the needle, the cylindrical block I, secured upon the shaft C and having an inclined groove encircling its periphery, and the oscillating nonrevoluble band encircling said groove and to which the looper is secured, substantially in the manner and :for the purpose herein set forth.

l. The combination, in. the stitch-forming mechanism of a sewi11g-machine, of the bedplate l, the reciprocai ing` needle F, the lon- ITO and a tension device, Q, fixed under the bedplate at. a point in the rear of the looper, all substantially in the manner and for the pur- 15 pose herein set forth.

In testimony whereof I have signed my .name to this specification in the presence of two subscribing Witnesses.

CIAIAS. XV. WEISS.

Witnesses:

JOHN A. RENNIE, E. M. WATSON. 

